diff --git a/LICENSE b/LICENSE
index 7202ce8c0..12b877a03 100644
--- a/LICENSE
+++ b/LICENSE
@@ -32,6 +32,10 @@ and with the following additions to the disclaimer:
    risk of satisfactory quality, performance, accuracy, and effort is with
    the user.
 
+Some files in the "contrib" directory and some configure-generated
+files that are distributed with libpng have other copyright owners and
+are released under other open source licenses.
+
 libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
 Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
 libpng-0.96, and are distributed according to the same disclaimer and
diff --git a/libpng.3 b/libpng.3
index 6914fc25a..832a5b7e7 100644
--- a/libpng.3
+++ b/libpng.3
@@ -6047,7 +6047,7 @@ this sentence.
 This code is released under the libpng license.
 
 libpng versions 1.0.7, July 1, 2000, through 1.7.0beta87, December 30, 2016, are
-Copyright (c) 2000-2002, 2004, 2006-2016 Glenn Randers-Pehrson, are
+Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
 derived from libpng-1.0.6, and are distributed according to the same
 disclaimer and license as libpng-1.0.6 with the following individuals
 added to the list of Contributing Authors:
@@ -6068,6 +6068,10 @@ and with the following additions to the disclaimer:
    risk of satisfactory quality, performance, accuracy, and effort is with
    the user.
 
+Some files in the "contrib" directory and some configure-generated
+files that are distributed with libpng have other copyright owners and
+are released under other open source licenses.
+
 libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
 Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
 libpng-0.96, and are distributed according to the same disclaimer and
diff --git a/png.h b/png.h
index 9533c2393..3de7ae07d 100644
--- a/png.h
+++ b/png.h
@@ -47,6 +47,10 @@
  *    risk of satisfactory quality, performance, accuracy, and effort is with
  *    the user.
  *
+ *    Some files in the "contrib" directory and some configure-generated
+ *    files that are distributed with libpng have other copyright owners and
+ *    are released under other open source licenses.
+ *
  * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
  * Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
  * libpng-0.96, and are distributed according to the same disclaimer and